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<title>Problem 1524. -- [POI2006]Pal -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>1524: [POI2006]Pal</h2><span class=green>Time Limit: </span>5 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>357 MB<br><span class=green>Submit: </span>213&nbsp;&nbsp;<span class=green>Solved: </span>74<br>[<a href='submitpage.php?id=1524'>Submit</a>][<a href='problemstatus.php?id=1524'>Status</a>][<a href='bbs.php?id=1524'>Discuss</a>]</center><h2>Description</h2><div class=content>给出n个回文串s1, s2, …, sn 
求如下二元组(i, j)的个数 
si + sj 仍然是回文串 

规模 
输入串总长不超过2M bytes 


</div><h2>Input</h2><div class=content>The first line of input file contains the number of strings n. The following n lines describe each string: 
The i+1-th line contains the length of the i-th string li, then a single space and a string of li small letters of English alphabet. 

You can assume that the total length of all strings will not exceed 2,000,000. Two strings in different line may be the same. 
</div><h2>Output</h2><div class=content>Print out only one integer, the number of palindromes</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>6 <br />
2 aa <br />
3 aba <br />
3 aaa <br />
6 abaaba <br />
5 aaaaa <br />
4 abba<br />
<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>14<br />
</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
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